Which rhythm is described as Normal and often seen in very old, very young, or athletes?

• A. Premature Atrial Complex
• B. Atrial Fibrillation
• C. Ventricular Tachycardia
• D. Junctional Rhythm

Answer: (A)

A premature atrial complex is a beat that starts in atrial tissue earlier than expected, producing a P wave that looks different from the normal sinus P wave, with a normally conducted QRS afterward. In healthy people, including very young individuals, very old individuals, and athletes, occasional PACs are a common benign finding. They don’t indicate sustained rhythm disturbance and often return the heart rhythm to normal without causing symptoms.

This description fits PACs because they are considered a normal variant seen across ages and in athletic individuals, reflecting transient atrial irritability or heightened autonomic activity rather than a pathologic rhythm. The other rhythms don’t match this context: atrial fibrillation lacks discrete P waves and is irregularly irregular; ventricular tachycardia presents as a rapid, wide-complex rhythm; a junctional rhythm typically shows absent or retrograde P waves and a slower rate.